Chapter 17

1. True or False: Streams and lakes contain a large percentage of the global water supply.

2. Which reservoir constitutes the largest fraction of the global FRESH water supply. streams and rivers glaciers groundwater lakes

3. How much water does a human need to survive on a daily basis? 10 liters 7 liters 5 liters 2 liters

4. How much water does the average American consume on a daily basis? 6000 liters 250 liters 50 liters 2 liters

5. Which of these rocks have high porosity? vuggy limestone sandstone unfractured shale unfractured granite both A and B both C and D

6. Which of these rocks have high permeability? vuggy limestone sandstone unfractured shale unfractured granite both A and B both C and D

7. An artesian well is free flowing because the well surface is: above the water table. at the water table. beneath the water table.

8. Which of the following rocks would make the best aquifer? granite with few fractures highly fractured granite unfractured shale unfractured schist

9. Which of the following sediments would make the best aquifer? gravel sand silt clay

10. True or False: The water table is always horizontal, like your kitchen table.

11. Which equation for the inputs and outputs of the water cycle in a given land area correctly groups the inputs and outputs? Precipitation = runoff + infiltration + evaporation + transpiration Precipitation + evaporation + transpiration = runoff + infiltration Precipitation + runoff = evaporation + transpiration + infiltration Precipitation + infiltration = runoff + evaporation + transpiration

land-surface subsidence. your well to go dry. 12. Excessive pumping of a well during a drought will lead to a deepening of the cone of depression. This in turn can cause: land-surface subsidence. your well to go dry. your neighbor’s well to go dry. All of the above. None of the above.

13. Which of the following is LEAST effective in combating the effects of a declining water table? deepening the well by drilling decreasing the pumping rate installing a more powerful pump modifying land use practices to decrease water need

14. A cone of depression forms when: rate of recharge > drawdown. rate of recharge = drawdown. rate of recharge < drawdown.

15. True or False: The rate of groundwater flow is constant throughout a region.

16. Which of these rock types is susceptible to karst formation? granite limestone sandstone schist

17. The well on the far right corner of this image: would be safe due to natural filtering capability of the aquifer. would be threatened by contamination.

18. Which type of water can be used to produce energy? hydrothermal waters channellized flow tidal flow All of the above.

19. Geysers and hot springs are due to heating of water at depth by: geothermal gradient. magma source. Both of the above.

20. When contaminants enter the groundwater: the contamination remains at the point source. contaminants spread out away from the point source in a plume. the contaminated water does not mix with the rest of the groundwater.